ASTM A268 TP409 Stainless Steel Seamless Tubes
Standard:ASTM A268 / ASME SA268
Grade:TP409 (UNS S40900)
Manufacturing Process：Cold Drawn Seamless (CDS), Hot Finished Seamless
Tube Type：Round Tube, Straight Tube, U Tube
Outside Diameter (OD)：6.0–168.3 mm (1/8"–6")
Wall Thickness (WT)：0.5–12.0 mm
Length：1–12 m, Random Length, Fixed Length, Custom Length
Surface Finish：Annealed & Pickled (AP), Bright Annealed (BA)
Ends：Plain End (PE), Beveled End (BE)
Inspection & Testing:Hydrostatic Test, Eddy Current Test, PMI Test, Flattening Test, Flaring Test, Hardness Test
Certificates:EN 10204 3.1 / 3.2 MTC, ISO 9001
Transport Package：Standard Sea-Worthy Packing
Send E-mail:info@gneestainless.com
Tel:+8615824687445
Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of ASTM A268 TP409 Stainless Steel Seamless Tubes in China. With abundant experience, we warmly welcome you to wholesale customized ASTM A268 TP409 Stainless Steel Seamless Tubes from our factory. For price consultation, contact us.
If you are looking for cost-effective, high-temperature resistant, and stable performance boiler tubes, our ASTM A268 TP409 seamless ferritic boiler tubes are designed to meet the demands of modern thermal energy systems. TP409 stainless steel tubes are a chromium-based ferritic stainless steel (containing approximately 10.5% to 11.75% chromium) that offers excellent oxidation resistance and thermal fatigue resistance under cyclic heating conditions, while also having lower alloy costs compared to austenitic stainless steels.
We manufacture and supply ASTM A268 TP409 seamless tubes in various outer diameters and wall thicknesses, utilizing hot piercing, cold drawing, and final annealing processes to ensure a uniform microstructure and smooth inner surface. Typical mechanical properties include a tensile strength of ≥380 MPa and good ductility, ensuring stable operation under boiler pressure and temperature fluctuations.
GNEE supplies seamless stainless steel pipes (ASTM A268/ASME SA268 TP409) with an outer diameter range of 6.0–168.3 mm (1/8"–6") and wall thickness of 0.5–12 mm. We offer cold-drawn and hot-rolled seamless options, as well as custom sizing and various surface finishes such as pickled (AP), bright annealed (BA), and polished. Material Test Certificates (MTC) compliant with EN 10204 3.1/3.2 and third-party inspection reports (e.g., SGS, BV, TÜV) are also available.
In addition to standard specifications, GNEE provides value-added services including cutting, beveling, U-bending, precision length cutting, and export-grade moisture-proof packaging; the typical lead time for standard specifications is 7–15 days.
ASTM A268 TP409 tube specification
| Item | Specification |
|---|---|
| Grade | TP409 (UNS S40900) |
| Manufacturing Process | Cold Drawn Seamless (CDS), Hot Finished Seamless |
| Tube Type | Round Tube, Straight Tube, U Tube |
| Outside Diameter (OD) | 6.0–168.3 mm (1/8"–6") |
| Wall Thickness (WT) | 0.5–12.0 mm |
| Length | 1–12 m, Random Length, Fixed Length, Custom Length |
| Surface Finish | Annealed & Pickled (AP), Bright Annealed (BA), Polished |
| Ends | Plain End (PE), Beveled End (BE) |
| Heat Treatment | Annealed |
| Inspection & Testing | Hydrostatic Test, Eddy Current Test, PMI Test, Flattening Test, Flaring Test, Hardness Test, Dimensional Inspection |
Chemical Composition % UNS S40900/TP 409
| Grade | Carbon | Manganese | Phosphorous | Sulfur | Silicon | Nickel | Chromium | Titanium |
| TP409 | 0.08 max | 1.00 max | 0.045max | 0.03max | 1.00max | 0.50max | 10.5-11.7 | 6×Cmin 0.75max |
Tensile Requirements
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| TP409 | 170min | 380min | 20 min |
ASTM A268 TP409 Stainless Steel Tube Equivalent Grades
| Grade | UNS No |
Euronorm |
Swedish | Japanese | ||
| No | Name | SS | JIS | |||
| 409 | S40900 | 1.4512 | X6CrTi12 / X2CrTi12 | - | SUS409 | |
Heat Treatment
As a final heat treatment, tubes shall be reheated to a temperature of 1200°F [650°C] or higher and cooled (as appropriate for the grade) to meet the requirements of this specification
Hardness Requirements
| Brinell Hardness,max | Rockwell Hardness,max |
| 207 | 95 |
What is the maximum operating temperature of TP409?
Continuous operating temperature: Up to 650°C (1200°F).
Intermittent operating temperature: Up to 815°C (1500°F).
Within this temperature range, its ability to form an oxidation-resistant scale is superior to that of carbon steel and certain low-alloy steels.
What welding consumables are recommended for TP409?
If superior weld toughness is required: ER308L or ER309L austenitic welding consumables are recommended.
If matching the coefficient of thermal expansion is required: 409Ti-specific welding consumables are recommended.
What is the difference between TP409 and TP304?
TP409 is a ferritic stainless steel containing approximately 10.5–11.75% chromium with excellent oxidation resistance and lower cost, while TP304 is an austenitic stainless steel containing 18–20% chromium and 8–10.5% nickel, offering significantly better corrosion resistance, weldability, and formability for demanding chemical and food-processing applications.
ASTM A268 TP409 Tube Applications
Automotive industry: Manifolds, exhaust pipes, catalytic converter housings, mufflers.
Heat exchange equipment: Heat exchanger tubes, boiler tubes, furnace components.
Agricultural equipment: Dryers, fertilizer spreader piping (replacing carbon steel to extend service life).
Industrial silencers: Exhaust systems for gas turbines and generator sets.
If you need specific help, please let me know:What dimensions (outer diameter and wall thickness) do you need?Are you looking for seamless or welded pipe?What is your intended application or operating temperature?
ASME SA 268 Tubes Testing
Tensile Test: Measures tensile strength, yield strength, and elongation.
Hardness Test: TP409 hardness is typically required not to exceed 179 HBW or 90 HRB.
Flattening Test: Compresses a pipe section to a specified distance to check for cracks.
Flaring Test: Expands the pipe end to a specified ratio to check for wall cracking.
Eddy Current Test: Detects surface and near-surface defects in the pipe.
Ultrasonic Test: For seamless pipes, checks for internal soundness and wall thickness uniformity.
Hydrostatic Test: Each pipe undergoes pressure testing to ensure no leakage occurs under high pressure.
SS 409 Pipe PMI
Dimensional Measurement
Packaging
Hexagonal Bundling: Small-diameter pipes are typically bundled in a hexagonal shape and secured with steel straps. Protective padding (such as paper or rubber) should be placed between the steel straps and the pipes to prevent scratching.
Wooden Cases: Recommended for seamless pipes (especially heat exchanger tubes). Wooden cases effectively prevent the pipes from bending or deforming during lifting and handling.
Woven Bag Packaging: After bundling, the exterior is wrapped in waterproof woven fabric.
Stenciling: Each pipe must bear clear, continuous stenciling containing the following information:
Standard and Grade: ASTM A268 TP409
Manufacturing Method: Seamless (SMLS)
Dimensions: Outside Diameter x Wall Thickness x Length
Heat No. and Lot No.
Manufacturer's Trademark/Name
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